Right, but wouldn't it be part of the A2, since it has to communicate positioning somehow? That's what I'm saying, since the P3 has OF, doesn't that rule it out as a Naza FC?

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No.
There are comm ports and other data busses (i.e.CanBus) which these are connected to.

Have you noticed the P2 compass and GPS are not part of the Naza either?

These plug into the main pcb which contains an imbedded processor.
This processor has numerous communication 'ports' and handles all the data parsing before it is sent to the Naza via it's 'EXP' port or terminals.